TERMINAL
A point at which information can enter or leave a communications network.

TERMINAL EQUIPMENT (TE)
Devices, apparatus and their associated interfaces used to forward information to a local customer or distant terminal.

TERMINATION
(1) An item that is connected to the terminal of a circuit or equipment. (2) An impedance connected to the end of a circuit being tested. (3) The points on a switching network to which a trunk or line may be attached.

TIE-LINE
A private leased line linking two phones or phone systems directly. Can ring distant phone automatically when telephone is lifted from its mounting, or when a short code is dialed.

TIME DIVISION MULTIPLEXING (TDM)
Equipment which enables the transmitting of a number of signals over a single common path by transmitting them sequentially at different instants of time.

TOLL CALL
Any call to a point outside the local service area.

TOLL CENTER (TC) (CO)
A central office where operators (human or mechanical) are present to assist in completing incoming toll calls.

TOLL OFFICE (TO) (TC)
A center for the switching of toll calls.

TOLL PLANT (TP) (TO)
The facilities that connect toll offices throughout the country.

TOLL RESTRICTION (TR)
A restriction in outgoing trunks which counts the first three digits dialed and diverts calls to forbidden codes either to a busy tone, to the operator, or to a recorded announcement.